Here is a list of the variables to enter into the folder scan exclusion and the location within the system they correspond to:

Variable in the scan exclusion

Analogous system location

[COMMON_APPDATA]

%ProgramData%

[PROGRAM_FILES]

%PROGRAMFILES%

[PROGRAM_FILES_COMMON]

%COMMONPROGRAMFILES%

[COMMON_PROGRAMS]

%ProgramData%\Microsoft\Windows\Start Menu\Programs

[COMMON_STARTUP]

%ProgramData%\Microsoft\Windows\Start Menu\Programs\Startup

[COMMON_DESKTOPDIRECTORY]

%PUBLIC%\Desktop

[COMMON_DOCUMENTS]

%PUBLIC%\Documents

[SYSTEM]

%WINDIR%\system32

[WINDOWS]

%WINDIR%

Note: Currently these variables work only for the full path. If using one of these, it cannot be combined with subfolders and the only option to exclude subfolders would be selecting "Include Subfolders" which includes every folder in the path.